/ Dictionary / Index A Actium: Meaning and Definition of Find definitions for: Ac•ti•um Pronunciation: (ak'tē-um, -shē-um), [key] — n. a promontory in NW ancient Greece: Antony and Cleopatra were defeated by Octavian and Agrippa in a naval battle near here in 31 b.c. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actium (Thesaurus) Actis activate Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language